The only part of my drive train that is original is my Rear Axle (Maybe). My 54 GMC 100 has a Chevy 261, SM420 4-spd, and a 3/4-ton drive shaft setup, which starts out as a closed shaft and then becomes open before the carrier bearing. I am thinking that a rear-end swap will be alot cheaper than rebuilding my existing rear-end w/ new gears.
